如何将具有日期时间的列中的每个单元格从 ms excel 插入到 mysql 数据库？答案

【问题标题】：How to insert every cell in columns with datetime from ms excel to mysql database?如何将具有日期时间的列中的每个单元格从 ms excel 插入到 mysql 数据库？
【发布时间】：2025-11-30 13:45:01
【问题描述】：

我在 C# .net 中编程大约 1 个月。现在我正在尝试用这种语言编写代码，将数据从 MS excel（Office 365）导入 datagridview，然后导入 mysql 数据库。在这种情况下，我有一张桌子，我在这张桌子上做：

Order_status table from MS Excel to DataGridView

当我将数据导入 datagridview 时，我尝试将数据插入 mysql 数据库。所有代码都在下面：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using MySql.Data.MySqlClient;
using System.Collections;
using System.Data.OleDb;
using System.IO;
using System.Configuration;

namespace ControlDataBase
{
    public partial class New_Tables : Form
    {
        public New_Tables()
        {
            InitializeComponent();
        }
        Form1 frm1 = (Form1)Application.OpenForms["Form1"];

        private void btnClose_Click(object sender, EventArgs e)
        {
            this.Close();
        }

        private void ImportData_Click(object sender, EventArgs e)
        {
            using (OpenFileDialog ofd = new OpenFileDialog() { Filter = "Excel Files|*.xlsx;*.xlsm;*.xlsb;*.xltx;*.xltm;*.xls;*.xlt;*.xls;*.xml;*.xml;*.xlam;*.xla;*.xlw;*.xlr;", ValidateNames = true })
            {
                if (ofd.ShowDialog() == DialogResult.OK)
                {
                    FileInfo fi = new FileInfo(ofd.FileName);
                    string FileName1 = ofd.FileName;

                    string excel = fi.FullName;

                    if (ofd.FileName.EndsWith(".xlsx"))
                    {
                        StrConn = @"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + excel + ";Extended Properties=\"Excel 12.0;\"";
                    }

                    if (ofd.FileName.EndsWith(".xls"))
                    {
                        StrConn = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + excel + ";Extended Properties=\"Excel 1.0;HDR=Yes;IMEX=1\"";
                    }
                    OleDbConnection oledbconn = new OleDbConnection(StrConn);

                    OleDbDataAdapter dta5 = new OleDbDataAdapter("SELECT * FROM [Order_status$]", oledbconn);
                    oledbconn.Open();

                    DataSet dsole5 = new DataSet();
                    dta5.Fill(dsole5, "Order_status$");
                    datagrdStatus_order.DataSource = dsole5.Tables["Order_status$"];

                    oledbconn.Close();

                    MySqlConnection connection = new MySqlConnection("datasource=localhost;port=3306;username=root;password=");
                    connection.Open();

                    for (int i = 0; i < datagrdStatus_order.Rows.Count; i++)
                    {
                        MySqlCommand cmd = new MySqlCommand("INSERT IGNORE INTO try1.order_status(ID_WORKER, ID_ORDER, ID_MODULE, ID_PROJECT, AMOUNT_OF_PRODUCTS, BEGIN_DATE, END_DATE) SELECT workers.ID_WORKER, orders.ID_ORDER, module.ID_MODULE, projects.ID, @AMOUNT_OF_PRODUCTS, @BEGIN_DATE, @END_DATE FROM try1.workers INNER JOIN try1.orders INNER JOIN try1.modules INNER JOIN try1.projects WHERE workers.FNAME = @FNAME AND workers.LNAME = @LNAME AND workers.ID_WORKER = @ID_WORKER AND orders.ORDER_DESC = @ORDER_DESC AND orders.ORDER_NUMBER = @ORDER_NUMBER AND modules.NAME = @MODULES_NAME AND projects.PROJECT_NAME = @PROJECT_NAME", connection);

                    DateTime begin_date = Convert.ToDateTime(datagrdStatus_order.Rows[i].Cells[8].Value);
                    DateTime end_date = Convert.ToDateTime(datagrdStatus_order.Rows[i].Cells[9].Value);

                        cmd.Parameters.AddWithValue("@ID_WORKER", datagrdStatus_order.Rows[i].Cells[0].Value);
                        cmd.Parameters.AddWithValue("@FNAME", datagrdStatus_order.Rows[i].Cells[1].Value);
                        cmd.Parameters.AddWithValue("@LNAME", datagrdStatus_order.Rows[i].Cells[2].Value);
                        cmd.Parameters.AddWithValue("@ORDER_DESC", datagrdStatus_order.Rows[i].Cells[3].Value);
                        cmd.Parameters.AddWithValue("@NUMBER_ORDER", datagrdStatus_order.Rows[i].Cells[4].Value);
                        cmd.Parameters.AddWithValue("@MODULES_NAME", datagrdStatus_order.Rows[i].Cells[5].Value);
                        cmd.Parameters.AddWithValue("@PROJECT_NAME", datagrdStatus_order.Rows[i].Cells[6].Value);
                        cmd.Parameters.AddWithValue("@AMOUNT_OF_PRODUCTS", datagrdStatus_order.Rows[i].Cells[7].Value);
                        cmd.Parameters.AddWithValue("@BEGIN_DATE", begin_date);
                        cmd.Parameters.AddWithValue("@END_DATE", end_date);
                        cmd.ExecuteNonQuery();
                    }
                    connection.Close();
                    MessageBox.Show("The data are imported correctly");

                    loaddataalldatagridview();
                }
            }
        }

        private void loaddataalldatagridview()
        {
            frm1.loaddata5();
        }
    }
}

当我执行该代码时，我在代码行得到错误：

DateTime begin_date = Convert.ToDateTime(datagrdStatus_order.Rows[i].Cells[8].Value);

其中显示：

System.InvalidCastException：“您不能从 DBNull 元素转换为其他类型。”

但它插入了大部分导入的数据，但不是全部。我想导入所有数据。

我试过什么？

1) 我被添加到日期时间对象只是.ToString();

            for (int i = 0; i < datagrdStatus_order.Rows.Count; i++)
            {
                MySqlCommand cmd = new MySqlCommand("INSERT IGNORE INTO try1.order_status(ID_WORKER, ID_ORDER, ID_MODULE, ID_PROJECT, AMOUNT_OF_PRODUCTS, BEGIN_DATE, END_DATE) SELECT workers.ID_WORKER, orders.ID_ORDER, module.ID_MODULE, projects.ID, @AMOUNT_OF_PRODUCTS, @BEGIN_DATE, @END_DATE FROM try1.workers INNER JOIN try1.orders INNER JOIN try1.modules INNER JOIN try1.projects WHERE workers.FNAME = @FNAME AND workers.LNAME = @LNAME AND workers.ID_WORKER = @ID_WORKER AND orders.ORDER_DESC = @ORDER_DESC AND orders.ORDER_NUMBER = @ORDER_NUMBER AND modules.NAME = @MODULES_NAME AND projects.PROJECT_NAME = @PROJECT_NAME", connection);

                DateTime begin_date = Convert.ToDateTime(datagrdStatus_order.Rows[i].Cells[8].Value.ToString());
                DateTime end_date = Convert.ToDateTime(datagrdStatus_order.Rows[i].Cells[9].Value.ToString());

                cmd.Parameters.AddWithValue("@ID_WORKER", datagrdStatus_order.Rows[i].Cells[0].Value);
                cmd.Parameters.AddWithValue("@FNAME", datagrdStatus_order.Rows[i].Cells[1].Value);
                cmd.Parameters.AddWithValue("@LNAME", datagrdStatus_order.Rows[i].Cells[2].Value);
                cmd.Parameters.AddWithValue("@ORDER_DESC", datagrdStatus_order.Rows[i].Cells[3].Value);
                cmd.Parameters.AddWithValue("@NUMBER_ORDER", datagrdStatus_order.Rows[i].Cells[4].Value);
                cmd.Parameters.AddWithValue("@MODULES_NAME", datagrdStatus_order.Rows[i].Cells[5].Value);
                cmd.Parameters.AddWithValue("@PROJECT_NAME", datagrdStatus_order.Rows[i].Cells[6].Value);
                cmd.Parameters.AddWithValue("@AMOUNT_OF_PRODUCTS", datagrdStatus_order.Rows[i].Cells[7].Value);
                cmd.Parameters.AddWithValue("@BEGIN_DATE", begin_date);
                cmd.Parameters.AddWithValue("@END_DATE", end_date);
                cmd.ExecuteNonQuery();
            }

但它显示：

System.FormatException: "字符串未被识别为有效的 DateTime。"

2) 我尝试通过向对象添加字符串然后转换为日期时间来尝试：

            for (int i = 0; i < datagrdStatus_order.Rows.Count; i++)
            {
                MySqlCommand cmd = new MySqlCommand("INSERT IGNORE INTO try1.order_status(ID_WORKER, ID_ORDER, ID_MODULE, ID_PROJECT, AMOUNT_OF_PRODUCTS, BEGIN_DATE, END_DATE) SELECT workers.ID_WORKER, orders.ID_ORDER, module.ID_MODULE, projects.ID, @AMOUNT_OF_PRODUCTS, @BEGIN_DATE, @END_DATE FROM try1.workers INNER JOIN try1.orders INNER JOIN try1.modules INNER JOIN try1.projects WHERE workers.FNAME = @FNAME AND workers.LNAME = @LNAME AND workers.ID_WORKER = @ID_WORKER AND orders.ORDER_DESC = @ORDER_DESC AND orders.ORDER_NUMBER = @ORDER_NUMBER AND modules.NAME = @MODULES_NAME AND projects.PROJECT_NAME = @PROJECT_NAME", connection);

                DateTime begin_date = Convert.ToDateTime(datagrdStatus_order.Rows[i].Cells[8].Value);
                string MysqlFormatDate = begin_date.ToString("yyyy-MM-dd HH:mm:ss");
                DateTime begin_date2 = Convert.ToDateTime(MysqlFormatDate);

                DateTime end_date = Convert.ToDateTime(datagrdStatus_order.Rows[i].Cells[9].Value);
                string MysqlFormatDate2 = end_date.ToString("yyyy-MM-dd HH:mm:ss");
                DateTime end_date2 = Convert.ToDateTime(MysqlFormatDate2);

                cmd.Parameters.AddWithValue("@ID_WORKER", datagrdStatus_order.Rows[i].Cells[0].Value);
                cmd.Parameters.AddWithValue("@FNAME", datagrdStatus_order.Rows[i].Cells[1].Value);
                cmd.Parameters.AddWithValue("@LNAME", datagrdStatus_order.Rows[i].Cells[2].Value);
                cmd.Parameters.AddWithValue("@ORDER_DESC", datagrdStatus_order.Rows[i].Cells[3].Value);
                cmd.Parameters.AddWithValue("@NUMBER_ORDER", datagrdStatus_order.Rows[i].Cells[4].Value);
                cmd.Parameters.AddWithValue("@MODULES_NAME", datagrdStatus_order.Rows[i].Cells[5].Value);
                cmd.Parameters.AddWithValue("@PROJECT_NAME", datagrdStatus_order.Rows[i].Cells[6].Value);
                cmd.Parameters.AddWithValue("@AMOUNT_OF_PRODUCTS", datagrdStatus_order.Rows[i].Cells[7].Value);
                cmd.Parameters.AddWithValue("@BEGIN_DATE", begin_date2);
                cmd.Parameters.AddWithValue("@END_DATE", end_date2);
                cmd.ExecuteNonQuery();
            }

但它也不起作用（它显示错误，就像在第一次尝试中一样）。

3) 我声明了字符串对象并转换为日期时间：

            for (int i = 0; i < datagrdStatus_order.Rows.Count; i++)
            {
                MySqlCommand cmd = new MySqlCommand("INSERT IGNORE INTO try1.order_status(ID_WORKER, ID_ORDER, ID_MODULE, ID_PROJECT, AMOUNT_OF_PRODUCTS, BEGIN_DATE, END_DATE) SELECT workers.ID_WORKER, orders.ID_ORDER, module.ID_MODULE, projects.ID, @AMOUNT_OF_PRODUCTS, @BEGIN_DATE, @END_DATE FROM try1.workers INNER JOIN try1.orders INNER JOIN try1.modules INNER JOIN try1.projects WHERE workers.FNAME = @FNAME AND workers.LNAME = @LNAME AND workers.ID_WORKER = @ID_WORKER AND orders.ORDER_DESC = @ORDER_DESC AND orders.ORDER_NUMBER = @ORDER_NUMBER AND modules.NAME = @MODULES_NAME AND projects.PROJECT_NAME = @PROJECT_NAME", connection);

                string begin_date = Convert.ToDateTime(datagrdStatus_order.Rows[i].Cells[8].Value).ToString("yyyy-MM-dd HH:mm:ss");
                string end_date = Convert.ToDateTime(datagrdStatus_order.Rows[i].Cells[9].Value).ToString("yyyy-MM-dd HH:mm:ss");

                cmd.Parameters.AddWithValue("@ID_WORKER", datagrdStatus_order.Rows[i].Cells[0].Value);
                cmd.Parameters.AddWithValue("@FNAME", datagrdStatus_order.Rows[i].Cells[1].Value);
                cmd.Parameters.AddWithValue("@LNAME", datagrdStatus_order.Rows[i].Cells[2].Value);
                cmd.Parameters.AddWithValue("@ORDER_DESC", datagrdStatus_order.Rows[i].Cells[3].Value);
                cmd.Parameters.AddWithValue("@NUMBER_ORDER", datagrdStatus_order.Rows[i].Cells[4].Value);
                cmd.Parameters.AddWithValue("@MODULES_NAME", datagrdStatus_order.Rows[i].Cells[5].Value);
                cmd.Parameters.AddWithValue("@PROJECT_NAME", datagrdStatus_order.Rows[i].Cells[6].Value);
                cmd.Parameters.AddWithValue("@AMOUNT_OF_PRODUCTS", datagrdStatus_order.Rows[i].Cells[7].Value);
                cmd.Parameters.AddWithValue("@BEGIN_DATE", begin_date);
                cmd.Parameters.AddWithValue("@END_DATE", end_date);
                cmd.ExecuteNonQuery();
            }

然后它显示错误：

System.InvalidCastException：“您不能从 DBNull 元素进行转换到其他类型。”

我不知道如何解决它。我正在寻找解决方案我还没有找到它？有人可以解释如何解决吗？有任何想法吗？感谢您的任何帮助和建议。 :)

【问题讨论】：

欢迎来到 Stack Overflow。你能先检查一下这个问题吗？它似乎描述了你的问题*.com/q/19075574/447156
嗨@SonerGönül。谢谢你的评论。但我只看到 int32 类型。你认为它适用于日期时间类型吗？
您的值似乎来自您的数据库中的DBNull。首先检查它是DBNull，如果不是，那么你可以调用它的值并使用它。
@Johnyblumer2012 你的for 循环以i = 0 开头，所以你可能会在第一次迭代中得到列标题名称，也许这就是错误的原因
@akg179 当我第一次创建 ms excel 表时（在修改为下拉列表之前），它对我来说一切正常。所以我认为我循环中的i=0 不会导致该错误。

标签： c# mysql .net excel datetime

【解决方案1】：

为了使用 Excel 操作，首先要做的就是在项目中包含 Microsoft.Office 对象库引用。

using Excel=Microsoft.Office.Interop.Excel;

并尝试像这样转换 dateTime ：

DateTime begin_Date= DateTime.ParseExact(row[8].ToString(), "yyyy-MM-dd", cultureUS, DateTimeStyles.None);

【讨论】：

嗨@Syafiqur。真的吗？我是否可以在不声明 datagridview 的情况下转换日期时间？
你必须先将Excel声明为dataTable，然后再转换dateTime。所以gridView可以retireve dateTime的值
恐怕你的带日期时间的代码行不行。
真的吗？它对我有用。尝试使用其他转换器进行转换。

【解决方案2】：

也许可以这样尝试：

foreach (DataGridViewRow row in datagrdStatus_order.Rows)
{
    string constring = "datasource = localhost; port = 3306; username = root; password = ";
    using (MySqlConnection con = new MySqlConnection(constring))
    {
        using (MySqlCommand cmd = new MySqlCommand("INSERT IGNORE INTO try1.order_status(ID_WORKER, ID_ORDER, ID_MODULE, ID_PROJECT, AMOUNT_OF_PRODUCTS, BEGIN_DATE, END_DATE) SELECT workers.ID_WORKER, orders.ID_ORDER, module.ID_MODULE, projects.ID, @AMOUNT_OF_PRODUCTS, @BEGIN_DATE, @END_DATE FROM try1.workers INNER JOIN try1.orders INNER JOIN try1.modules INNER JOIN try1.projects WHERE workers.FNAME = @FNAME AND workers.LNAME = @LNAME AND workers.ID_WORKER = @ID_WORKER AND orders.DESC_ORDER = @DESC_ORDER AND orders.ORDER_NUMBER = @ORDER_NUMBER AND modules.NAME = @MODULES_NAME AND projects.PROJECT_NAME = @PROJECT_NAME", con))
        {
            cmd.Parameters.AddWithValue("@ID_WORKER", row.Cells["ID_WORKER"].Value);
            cmd.Parameters.AddWithValue("@FNAME", row.Cells["FNAME"].Value);
            cmd.Parameters.AddWithValue("@LNAME", row.Cells["LNAME"].Value);
            cmd.Parameters.AddWithValue("@DESC_ORDER", row.Cells["DESC_ORDER"].Value);
            cmd.Parameters.AddWithValue("@ORDER_NUMBER", row.Cells["ORDER_NUMBER"].Value);
            cmd.Parameters.AddWithValue("@MODULES_NAME", row.Cells["NAME"].Value);
            cmd.Parameters.AddWithValue("@PROJECT_NAME", row.Cells["PROJECT_NAME"].Value);
            cmd.Parameters.AddWithValue("@AMOUNT_OF_PRODUCTS", row.Cells["AMOUNT_OF_PRODUCTS"].Value);
            cmd.Parameters.AddWithValue("@BEGIN_DATE", row.Cells["BEGIN_DATE"].Value);
            cmd.Parameters.AddWithValue("@END_DATE", row.Cells["END_DATE"].Value);
            con.Open();
            cmd.ExecuteNonQuery();
            con.Close();
        }
    }
}

【讨论】：